I ended up buying the pack.
The main highlight of this are the drumkits and synth voices, along with the revoiced styles that really stand out.
Piano sounds are nothing special (I believe it's difficult to make a good piano voice), since lowest octaves are weak, velocity is not the same as internal piano voices and there is no filter on smooth playing).
The creators say they will update the packs for the ones that have bought it for free.
I also tried to revoice some of the styles with the new drumkits and they completely transform the style and sound amazing. All the waveforms are completely new across all the keyboard.
EDIT: the piano sounds get much better if EQ'd correctly and slightly change the velocity control in the sound edit. I still have to connect the PC to further edit the sound.